How to Calculate Minimum Jacket Surface Area for a Double Jacketed Tank?

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Discussion Overview

The discussion revolves around the calculation of the minimum jacket surface area required for a double jacketed tank used in brewing beer. Participants explore the necessary heating rates, fluid temperatures, and material considerations relevant to the design of the tank.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant seeks assistance in calculating the minimum jacket surface area for a double jacketed tank, specifying a heating rate of 0.5-1 C/min and a target temperature of ~65C.
  • Another participant asserts that there is no defined minimum jacket area, suggesting that the problem needs clearer definition, particularly regarding the temperature of the heating fluid.
  • A later reply clarifies that the heating liquid will be water, aimed to be close to 65C to avoid hot spots, despite the need for stirring.
  • Another participant advises reconsidering the water temperature, noting that heat transfer is proportional to the temperature difference, which may affect heating rates as the liquid approaches the target temperature.
  • The original poster acknowledges the need to heat the jacket to a temperature slightly above the target, indicating a preference to maintain a range of 3-5C above the desired temperature without using boiling water.

Areas of Agreement / Disagreement

Participants express differing views on the necessity and implications of jacket surface area calculations, with some emphasizing the importance of temperature differentials while others focus on the specific design requirements. The discussion remains unresolved regarding the optimal approach to determining the minimum jacket surface area.

Contextual Notes

Participants have not fully defined the parameters of the problem, such as the specific heating fluid temperature and the implications of varying jacket sizes on heat transfer efficiency. There are also unresolved considerations regarding the engineering limits of materials used in the tank design.

john11
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Hello,

I am trying to design a double jacketed tank for brewing beer. Heating rate rewuired 0.5-1 C/min. Inside capacity of 300-400 liter liquid at ~1.05 d + grain, tank capacity of 600 liter. I can not find a proper calculation for a minimum jacket surface area required for this aplication. I nead to heat all this to ~65C using hot water in the jacket. Also the material of the tank is stainless steel 304.
I will be very thankfull for help with the calculations, preffered metric system. Or at least refference to a relevant equations.
Thank you
 
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There is no minimum jacket area. The smaller the jacket the greater the temp. Difference is required. At some point the limits of engineering materials will be reached. In other words, you need to define your problem more clearly. What is the temp of the heating fluid?
 
Right. The heating liquid will be water at temperature as close as possible to the temperature I want to reach inside the tank mainly around 65C. This to avoid hot spots near the jacket although it will be stirred slowly.
 
You may want to rethink your water temp. Heat transfer is proportional to temp difference so as the booze approaches the target temp the heating rate will tend to zero.
 
You are right again. That's why I said as close as possible. I am aware that if for example I will want to bring the temperature to 65C I will have to heat the jacket to 67-68 and that's fine. But i would like to stay in the range of 3-5C above the targeted temperature and not to heat the jacket with boiling water.
 

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